Measure in at least three places – the top, bottom, and middle of the window.
If the chords are on one side, you can cut only from the other side. In many ways, only cutting one side is much easier.
Remove the metal end stiffener bracket from the side(s) you are cutting. Use the hacksaw or tin snips to cut the headrail per your measured mark. File any rough edges with a metal file. However, keep in mind that the headrail edges will be covered by the mounting brackets, so a rough cut will not be visible. Replace the metal end stiffener onto the newly cut headrail. [1] X Research source
The band or clamp should be on the inside of wherever you’re making your cut.
